Analysis of iodine nutrition of vulnerable population in the high risk region of iodine deficiency disorders in Qinghai province in 2009 / 中国地方病学杂志

ABSTRACT

Objective To investigate the iodine nutrition level of the vulnerable population in the high risk region of iodine deficiency disorders for providing a scientific basis for the development of effective preventive measures in Qinghai province. Methods The non-iodized salt coverage rate ＞ 5％ of Delingha city, the coverage rate of iodized salt and the rate of qualified iodized salt ≤80％ of Jiuzhi, Wulan, Nangqian, Zaduo, Geermu,Yushu, Gande, Chengduo, and Dulan counties(cities), the median of urinary iodine ＜ 100 μg/L of Huangyuan county of 11 areas were chosen as monitoring area in 2009. Five townships(towns) were selected by their location of east, west, south, north and center in each county (city), and one school was selected in each township (town),and 60 household salt samples were collected in each school, and quantitatively determined by direct titration of iodine(GB/T 13025.7-1999). Three townships(towns) were selected in each county(city), and two schools were selected in each township(town). The content of urinary iodine of 40 children aged 8 - 10 and 20 women of childbearing age aged 18 - 40 was analyzed by As3+-Ce4+ catalytic spectrophotometry (WS/T 107-2006). ResultsThree thousand two hundred and sixty-one edible salt samples were tested. The coverage rate of iodized salt was 79.88％.The iodized salt qualification rate was 95.16％. The qualified iodized salt consumption rate was 76.02％. The noniodized salt coverage rate was 20.12％. In Nangqian, Zaduo, Yushu and Geermu counties(cities), the non-iodized salt coverage rate was 88.89％, 45.05％, 43.00％ and 12.67％, respectively. The median of urine iodine of 2536 children aged 8 - 10 was 155.8 μg/L, with ≤50 μg/L about 13.6％ (346/2536), ＞ 100 μg/L about 67.5％(1711/2536), and it was 75.1, 94.6 μg/L in Nangqian and Zaduo counties, respectively. The median of urine iodine of 665 women of childbearing age was 129.7 μg/L, with ≤50 μg/L about 22.7％(151/665), ＞ 100 μg/L about 59.2％(394/665), and it was 21.0, 54.7, 72.7 μg/L in Zaduo, Nangqian and Chengduo counties, respectively.Conclusions Insufficient intake of iodine exits in children and women of childbearing age in high risk region of iodine deficiency disorders in Qinghai province, which should be corrected as soon as possible.